<template>
  <view class="tui-container" @touchmove.stop.prevent="stop">
    <view
      class="tui-image-cropper"
      :change:prop="parse.propsChange"
      :prop="props"
      :data-lockRatio="lockRatio"
      :data-lockWidth="lockWidth"
      :data-lockHeight="lockHeight"
      :data-maxWidth="maxWidth"
      :data-minWidth="minWidth"
      :data-maxHeight="maxHeight"
      :data-minHeight="minHeight"
      :data-width="width"
      :data-height="height"
      :data-limitMove="limitMove"
      :data-windowHeight="sysInfo.windowHeight || 600"
      :data-windowWidth="sysInfo.windowWidth || 400"
      :data-imgTop="imgTop"
      :data-imgLeft="imgLeft"
      :data-imgWidth="imgWidth"
      :data-imgHeight="imgHeight"
      :data-angle="angle"
      @touchend="parse.cutTouchEnd"
      @touchstart="parse.cutTouchStart"
      @touchmove="parse.cutTouchMove"
    >
      <view class="tui-content">
        <view
          class="tui-content-top tui-bg-transparent"
          :style="{ transitionProperty: cutAnimation ? '' : 'background' }"
        ></view>
        <view class="tui-content-middle">
          <view
            class="tui-bg-transparent tui-wxs-bg"
            :style="{ transitionProperty: cutAnimation ? '' : 'background' }"
          ></view>
          <view
            class="tui-cropper-box"
            :style="{
              borderColor: borderColor,
              transitionProperty: cutAnimation ? '' : 'background',
            }"
          >
            <view
              v-for="(item, index) in 4"
              :key="index"
              class="tui-edge"
              :class="[
                `tui-${index < 2 ? 'top' : 'bottom'}-${
                  index === 0 || index === 2 ? 'left' : 'right'
                }`,
              ]"
              :style="{
                width: edgeWidth,
                height: edgeWidth,
                borderColor: edgeColor,
                borderWidth: edgeBorderWidth,
                left: index === 0 || index === 2 ? `-${edgeOffsets}` : 'auto',
                right: index === 1 || index === 3 ? `-${edgeOffsets}` : 'auto',
                top: index < 2 ? `-${edgeOffsets}` : 'auto',
                bottom: index > 1 ? `-${edgeOffsets}` : 'auto',
              }"
            ></view>
          </view>
          <view
            class="tui-flex-auto tui-bg-transparent"
            :style="{ transitionProperty: cutAnimation ? '' : 'background' }"
          ></view>
        </view>
        <view
          class="tui-flex-auto tui-bg-transparent"
          :style="{ transitionProperty: cutAnimation ? '' : 'background' }"
        ></view>
      </view>
      <image
        @load="imageLoad"
        @error="imageLoad"
        @touchstart="parse.touchstart"
        @touchmove="parse.touchmove"
        @touchend="parse.touchend"
        :data-minScale="minScale"
        :data-maxScale="maxScale"
        :data-disableRotate="disableRotate"
        :style="{
          width: imgWidth ? imgWidth + 'px' : 'auto',
          height: imgHeight ? imgHeight + 'px' : 'auto',
          transitionDuration: (cutAnimation ? 0.3 : 0) + 's',
        }"
        class="tui-cropper-image"
        :src="imageUrl"
        v-if="imageUrl"
        mode="widthFix"
      ></image>
    </view>
    <canvas
      canvas-id="tui-image-cropper"
      id="tui-image-cropper"
      :disable-scroll="true"
      :style="{
        width: CROPPER_WIDTH * scaleRatio + 'px',
        height: CROPPER_HEIGHT * scaleRatio + 'px',
      }"
      class="tui-cropper-canvas"
    ></canvas>
    <view class="tui-cropper-tabbar" v-if="!custom">
      <view class="tui-op-btn" @tap.stop="back">取消</view>
      <image :src="rotateImg" class="tui-rotate-img" @tap="setAngle"></image>
      <view class="tui-op-btn" @tap.stop="getImage">完成</view>
    </view>
  </view>
</template>
<script src="./tui-picture-cropper.wxs" module="parse" lang="wxs"></script>
<script>
/**
 * 注意：组件中使用的图片地址，将文件复制到自己项目中
 * 如果图片位置与组件同级，编译成小程序时图片会丢失
 * 拷贝static下整个components文件夹
 *也可直接转成base64（不建议）
 * */
export default {
  name: 'tuiPictureCropper',
  emits: ['ready', 'cropper', 'initAngle', 'imageLoad'],
  props: {
    //图片路径
    imageUrl: {
      type: String,
      default: '',
    },
    /*
		 默认正方形，可修改大小控制比例
		 裁剪框高度 px
		*/
    height: {
      type: Number,
      default: 280,
    },
    //裁剪框宽度 px
    width: {
      type: Number,
      default: 280,
    },
    //裁剪框最小宽度 px
    minWidth: {
      type: Number,
      default: 100,
    },
    //裁剪框最小高度 px
    minHeight: {
      type: Number,
      default: 100,
    },
    //裁剪框最大宽度 px
    maxWidth: {
      type: Number,
      default: 360,
    },
    //裁剪框最大高度 px
    maxHeight: {
      type: Number,
      default: 360,
    },
    //裁剪框border颜色
    borderColor: {
      type: String,
      default: 'rgba(255,255,255,0.1)',
    },
    //裁剪框边缘线颜色
    edgeColor: {
      type: String,
      default: '#FFFFFF',
    },
    //裁剪框边缘线宽度 w=h
    edgeWidth: {
      type: String,
      default: '34rpx',
    },
    //裁剪框边缘线border宽度
    edgeBorderWidth: {
      type: String,
      default: '6rpx',
    },
    //偏移距离，根据edgeBorderWidth进行调整
    edgeOffsets: {
      type: String,
      default: '6rpx',
    },
    /**
     * 如果宽度和高度都为true则裁剪框禁止拖动
     * 裁剪框宽度锁定
     */
    lockWidth: {
      type: Boolean,
      default: false,
    },
    //裁剪框高度锁定
    lockHeight: {
      type: Boolean,
      default: false,
    },
    //锁定裁剪框比例（放大或缩小）
    lockRatio: {
      type: Boolean,
      default: false,
    },
    //生成的图片尺寸相对剪裁框的比例
    scaleRatio: {
      type: Number,
      default: 2,
    },
    //图片的质量，取值范围为 (0, 1]，不在范围内时当作1.0处理
    quality: {
      type: Number,
      default: 0.8,
    },
    //图片旋转角度
    rotateAngle: {
      type: Number,
      default: 0,
    },
    //图片最小缩放比
    minScale: {
      type: Number,
      default: 0.5,
    },
    //图片最大缩放比
    maxScale: {
      type: Number,
      default: 2,
    },
    //是否禁用触摸旋转（为false则可以触摸转动图片，limitMove为false生效）
    disableRotate: {
      type: Boolean,
      default: true,
    },
    //是否限制移动范围(剪裁框只能在图片内,为true不可触摸转动图片)
    limitMove: {
      type: Boolean,
      default: true,
    },
    //自定义操作栏（为true时隐藏底部操作栏）
    custom: {
      type: Boolean,
      default: false,
    },
    //值发生改变开始裁剪（custom为true时生效）
    startCutting: {
      type: [Number, Boolean],
      default: 0,
    },
    /**
     * 是否返回base64(H5端默认base64)
     * 支持平台：App，微信小程序，支付宝小程序,H5(默认url就是base64)
     **/
    isBase64: {
      type: Boolean,
      default: false,
    },
    //裁剪时是否显示loadding
    loadding: {
      type: Boolean,
      default: true,
    },
    //旋转icon
    rotateImg: {
      type: String,
      default: '/static/components/cropper/img_rotate.png',
    },
  },
  data() {
    return {
      TIME_CUT_CENTER: null,
      CROPPER_WIDTH: 200, //裁剪框宽
      CROPPER_HEIGHT: 200, //裁剪框高
      cutX: 0, //画布x轴起点
      cutY: 0, //画布y轴起点0
      canvasWidth: 0,
      canvasHeight: 0,
      imgWidth: 0, //图片宽度
      imgHeight: 0, //图片高度
      scale: 1, //图片缩放比
      angle: 0, //图片旋转角度
      cutAnimation: false, //是否开启图片和裁剪框过渡
      cutAnimationTime: null,
      imgTop: 0, //图片上边距
      imgLeft: 0, //图片左边距
      ctx: null,
      sysInfo: {},
      props: '',
      sizeChange: 0, //2
      angleChange: 0, //3
      resetChange: 0, //4
      centerChange: 0, //5
    };
  },
  watch: {
    //定义变量然后利用change触发
    imageUrl(val, oldVal) {
      this.imageReset();
      this.showLoading();
      uni.getImageInfo({
        src: val,
        success: (res) => {
          //计算图片尺寸
          this.imgComputeSize(res.width, res.height);
          if (this.limitMove) {
            this.angleChange++;
            this.props = `3,${this.angleChange}`;
          }
        },
        fail: (err) => {
          this.imgComputeSize();
          if (this.limitMove) {
            this.angleChange++;
            this.props = `3,${this.angleChange}`;
          }
        },
      });
    },
    rotateAngle(val) {
      this.cutAnimation = true;
      this.angle = val;
      this.angleChanged(val);
    },
    cutAnimation(val) {
      //开启过渡260毫秒之后自动关闭
      clearTimeout(this.cutAnimationTime);
      if (val) {
        this.cutAnimationTime = setTimeout(() => {
          this.cutAnimation = false;
        }, 260);
      }
    },
    limitMove(val) {
      if (val) {
        this.angleChanged(this.angle);
      }
    },
    startCutting(val) {
      if (this.custom && val) {
        this.getImage();
      }
    },
  },
  mounted() {
    this.sysInfo = uni.getSystemInfoSync();
    this.imgTop = this.sysInfo.windowHeight / 2;
    this.imgLeft = this.sysInfo.windowWidth / 2;
    this.CROPPER_WIDTH = this.width;
    this.CROPPER_HEIGHT = this.height;
    this.canvasHeight = this.height;
    this.canvasWidth = this.width;
    this.ctx = uni.createCanvasContext('tui-image-cropper', this);
    //初始化
    setTimeout(() => {
      this.props = '1,1';
    }, 0);
    setTimeout(() => {
      this.$emit('ready', {});
    }, 200);
  },
  methods: {
    //网络图片转成本地文件[同步执行]
    async getLocalImage(url) {
      return await new Promise((resolve, reject) => {
        uni.downloadFile({
          url: url,
          success: (res) => {
            resolve(res.tempFilePath);
          },
          fail: (res) => {
            reject(false);
          },
        });
      });
    },
    //返回裁剪后图片信息
    getImage() {
      if (!this.imageUrl) {
        uni.showToast({
          title: '请选择图片',
          icon: 'none',
        });
        return;
      }
      this.loadding && this.showLoading();
      let draw = async () => {
        //图片实际大小
        let imgWidth = this.imgWidth * this.scale * this.scaleRatio;
        let imgHeight = this.imgHeight * this.scale * this.scaleRatio;
        //canvas和图片的相对距离
        let xpos = this.imgLeft - this.cutX;
        let ypos = this.imgTop - this.cutY;
        //旋转画布
        this.ctx.translate(xpos * this.scaleRatio, ypos * this.scaleRatio);
        this.ctx.rotate((this.angle * Math.PI) / 180);
        let imgUrl = this.imageUrl;
        // #ifdef APP-PLUS || MP-WEIXIN
        if (~this.imageUrl.indexOf('https:')) {
          imgUrl = await this.getLocalImage(this.imageUrl);
        }
        // #endif
        this.ctx.drawImage(imgUrl, -imgWidth / 2, -imgHeight / 2, imgWidth, imgHeight);
        this.ctx.draw(false, () => {
          let params = {
            width: this.canvasWidth * this.scaleRatio,
            height: Math.round(this.canvasHeight * this.scaleRatio),
            destWidth: this.canvasWidth * this.scaleRatio,
            destHeight: Math.round(this.canvasHeight) * this.scaleRatio,
            fileType: 'png',
            quality: this.quality,
          };
          let data = {
            url: '',
            base64: '',
            width: this.canvasWidth * this.scaleRatio,
            height: this.canvasHeight * this.scaleRatio,
          };
          // #ifdef MP-ALIPAY

          if (this.isBase64) {
            this.ctx.toDataURL(params).then((dataURL) => {
              data.base64 = dataURL;
              this.loadding && uni.hideLoading();
              this.$emit('cropper', data);
            });
          } else {
            this.ctx.toTempFilePath({
              ...params,
              success: (res) => {
                data.url = res.apFilePath;
                this.loadding && uni.hideLoading();
                this.$emit('cropper', data);
              },
            });
          }
          // #endif

          // #ifndef MP-ALIPAY
          // #ifdef MP-BAIDU || MP-TOUTIAO || H5
          this.isBase64 = false;
          // #endif
          if (this.isBase64) {
            uni.canvasGetImageData(
              {
                canvasId: 'tui-image-cropper',
                x: 0,
                y: 0,
                width: this.canvasWidth * this.scaleRatio,
                height: Math.round(this.canvasHeight * this.scaleRatio),
                success: (res) => {
                  const arrayBuffer = new Uint8Array(res.data);
                  const base64 = uni.arrayBufferToBase64(arrayBuffer);
                  data.base64 = base64;
                  this.loadding && uni.hideLoading();
                  this.$emit('cropper', data);
                },
              },
              this,
            );
          } else {
            uni.canvasToTempFilePath(
              {
                ...params,
                canvasId: 'tui-image-cropper',
                success: (res) => {
                  data.url = res.tempFilePath;
                  // #ifdef H5
                  data.base64 = res.tempFilePath;
                  // #endif
                  this.loadding && uni.hideLoading();
                  this.$emit('cropper', data);
                },
                fail(res) {
                  console.log(res);
                },
              },
              this,
            );
          }
          // #endif
        });
      };
      if (this.CROPPER_WIDTH != this.canvasWidth || this.CROPPER_HEIGHT != this.canvasHeight) {
        this.CROPPER_WIDTH = this.canvasWidth;
        this.CROPPER_HEIGHT = this.canvasHeight;
        this.$nextTick(() => {
          this.ctx.draw();
          setTimeout(() => {
            draw();
          }, 100);
        });
      } else {
        draw();
      }
    },
    change(e) {
      this.cutX = e.cutX || 0;
      this.cutY = e.cutY || 0;
      this.canvasWidth = e.canvasWidth || this.width;
      this.canvasHeight = e.canvasHeight || this.height;
      this.imgWidth = e.imgWidth || this.imgWidth;
      this.imgHeight = e.imgHeight || this.imgHeight;
      this.scale = e.scale || 1;
      this.angle = e.angle || 0;
      this.imgTop = e.imgTop || 0;
      this.imgLeft = e.imgLeft || 0;
    },
    imageReset() {
      this.scale = 1;
      this.angle = 0;
      let sys = this.sysInfo.windowHeight ? this.sysInfo : uni.getSystemInfoSync();
      this.imgTop = sys.windowHeight / 2;
      this.imgLeft = sys.windowWidth / 2;
      this.resetChange++;
      this.props = `4,${this.resetChange}`;
      //初始化旋转角度 0deg
      this.$emit('initAngle', {});
    },
    imageLoad(e) {
      this.imageReset();
      uni.hideLoading();
      this.$emit('imageLoad', {});
    },

    imgComputeSize(width, height) {
      //默认按图片最小边 = 对应裁剪框尺寸
      let imgWidth = width,
        imgHeight = height;
      if (imgWidth && imgHeight) {
        if (imgWidth / imgHeight > this.width / this.height) {
          imgHeight = this.height;
          imgWidth = (width / height) * imgHeight;
        } else {
          imgWidth = this.width;
          imgHeight = (height / width) * imgWidth;
        }
      } else {
        let sys = this.sysInfo.windowHeight ? this.sysInfo : uni.getSystemInfoSync();
        imgWidth = sys.windowWidth;
        imgHeight = 0;
      }
      this.imgWidth = imgWidth;
      this.imgHeight = imgHeight;
      this.sizeChange++;
      this.props = `2,${this.sizeChange}`;
    },
    moveStop() {
      clearTimeout(this.TIME_CUT_CENTER);
      this.TIME_CUT_CENTER = setTimeout(() => {
        if (!this.cutAnimation) {
          this.cutAnimation = true;
        }
        this.centerChange++;
        this.props = `5,${this.centerChange}`;
      }, 666);
    },
    moveDuring() {
      clearTimeout(this.TIME_CUT_CENTER);
    },
    showLoading() {
      uni.showLoading({
        title: '请稍候...',
        mask: true,
      });
    },
    stop() {},
    back() {
      uni.navigateBack();
    },
    angleChanged(val) {
      this.moveStop();
      if (this.limitMove && val % 90) {
        this.angle = Math.round(val / 90) * 90;
      }
      this.angleChange++;
      this.props = `3,${this.angleChange}`;
    },
    setAngle() {
      this.cutAnimation = true;
      this.angle = this.angle + 90;
      this.angleChanged(this.angle);
    },
  },
};
</script>

<style scoped>
.tui-container {
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
}

.tui-image-cropper {
  width: 100vw;
  height: 100vh;
  position: absolute;
}

.tui-content {
  width: 100vw;
  height: 100vh;
  position: absolute;
  z-index: 9;
  display: flex;
  flex-direction: column;
  pointer-events: none;
}

.tui-bg-transparent {
  background-color: rgba(0, 0, 0, 0.6);
  transition-duration: 0.3s;
}

.tui-content-top {
  pointer-events: none;
}

.tui-content-middle {
  width: 100%;
  height: 200px;
  display: flex;
  box-sizing: border-box;
}

.tui-cropper-box {
  position: relative;
  /* transition-duration: 0.2s; */
  border-style: solid;
  border-width: 1rpx;
  box-sizing: border-box;
}

.tui-flex-auto {
  flex: auto;
}

.tui-cropper-image {
  width: 100%;
  border-style: none;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform-origin: center;
}

.tui-cropper-canvas {
  position: fixed;
  z-index: 10;
  left: -2000px;
  top: -2000px;
  pointer-events: none;
}

.tui-edge {
  border-style: solid;
  pointer-events: auto;
  position: absolute;
  box-sizing: border-box;
}

.tui-top-left {
  border-bottom-width: 0 !important;
  border-right-width: 0 !important;
}

.tui-top-right {
  border-bottom-width: 0 !important;
  border-left-width: 0 !important;
}

.tui-bottom-left {
  border-top-width: 0 !important;
  border-right-width: 0 !important;
}

.tui-bottom-right {
  border-top-width: 0 !important;
  border-left-width: 0 !important;
}

.tui-cropper-tabbar {
  width: 100%;
  height: 120rpx;
  padding: 0 40rpx;
  box-sizing: border-box;
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #ffffff;
  font-size: 32rpx;
}

.tui-cropper-tabbar::after {
  content: ' ';
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  border-top: 1rpx solid rgba(255, 255, 255, 0.2);
  -webkit-transform: scaleY(0.5) translateZ(0);
  transform: scaleY(0.5) translateZ(0);
  transform-origin: 0 100%;
}

.tui-op-btn {
  height: 80rpx;
  display: flex;
  align-items: center;
}

.tui-rotate-img {
  width: 44rpx;
  height: 44rpx;
}
</style>
